Acetylene Oxygen
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How many moles of oxygen are needed to react completely with 2.50×10^24 molecules of acetylene?
The gaseous hydrocarbon acetylene,C2H2 , used in welders' torches, releases a large amount of heat when it burns according to the following equation:
2C2H2 + 5O2 ----> 4CO2 + 2H2O
moles acetylene = 2.50 x 10^24 / 6.02 x 10^23 =4.15
the ratio between C2H2 and O2 is 2 : 5
moles O2 = 4.15 x 5/2=10.4
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